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190                             ANCIENT EDENTATES                           CHAP.

to the Anteaters of the New World are chiefly adaptive and have
nothing to do with real affinity,, being merely an expression of a
similar mode of life, it is curious to note that here and there we
do find certain resemblances which do not seem to be susceptible
of the latter explanation. The jugal bone, absent in Manis, is
small in Myrmecopliaga ; the clavicle is absent and again small or
rudimentary in the Anteaters; it is large in other Edentates.

Pia. 109.  Manis.    Manis gigantea.

The third trochanter is absent, as in Ifyrmecopliaga (and the
Sloths), There are many scales on the body ; in Myrmetophaga,
there are traces of these structures on the tail, as also in
Tamandvdt,, In the features mentioned, the Myrmecophagidae
differ from either or from both of the two other American
families (i.e. Dasypodidae, Bradypodidae) and agree with Manis.
The facts are not a little remarkable.

Order HI.    GAHOBONTA.1
Allied to the Edentata, and apparently representing the
ancestral forms from which they, at any lute the Xenarthra
were derived, is the order of the Ganodonta. Of this order a
number of genera are now known, which can be ranged in a,
series which more and more approaches the Edentata as we pass
from the older to the newer forms. This interesting and transi-
tional series will be made manifest by a description of the
characters of the various genera taken in their proper chrono-
1 See Workman, "The Ganodonta and their Relationship * to the Edentata/"
Am, Mus* Nat. Hist. ix. 1897. rc. K